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Advisory ids must be last path segment in URL
Instead of the title, advisory ids should be used as path segment in URL
Ideally the url should look like this:
https://typo3.org/security/advisories/typo3-ext-sa-2017-019/ or https://typo3.org/security/advisories/typo3-core-sa-2017-007/
Redirects from old URLs should be applied